<template>
  <section class="todoapp">
    <todu-header @add="handlAdd"></todu-header>
    <todu-main
      :list="list2"
      @del="handlDel"
      @state="handlState"
      @changeAllState="handlAllState"
    ></todu-main>
    <todu-footer
      :flag="flag"
      :list="list"
      @clearCompleted="handlClear"
      @changeFlag="
        val => {
          flag = val
        }
      "
    ></todu-footer>
  </section>
</template>

<script>
import ToduFooter from './components/ToduFooter.vue'
import ToduHeader from './components/ToduHeader.vue'
import ToduMain from './components/ToduMain.vue'

export default {
  components: { ToduHeader, ToduMain, ToduFooter },
  data () {
    return {
      list: JSON.parse(localStorage.getItem('todo-list')) || [],
      // list: [
      //   { id: 12, name: '吃饭', isDone: false },
      //   { id: 14, name: '听歌', isDone: true },
      //   { id: 23, name: '洗澡', isDone: true },
      //   { id: 34, name: '睡觉', isDone: false },
      //   { id: 35, name: '游戏', isDone: false }
      // ],
      flag: 1 // 1-全部任务 2-进行中 3-已完成
    }
  },
  methods: {
    handlDel (id) {
      // console.log(id)
      this.list = this.list.filter(item => item.id !== id)
    },
    handlAdd (todo) {
      // console.log(todo)
      // this.list.push() // push 向数组末尾添加元素
      // this.list.unshift() // unshift 向数组的开头添加元素
      this.list.unshift({ id: Date.now(), name: todo, isDone: false })
    },
    handlState (id) {
      // console.log(id)
      const row = this.list.find(item => item.id === id)
      row.isDone = !row.isDone
    },
    handlClear () {
      // isDone=true的是已完成的  清除掉已完成的，就是保留未完成的
      this.list = this.list.filter(item => item.isDone === false)
    },
    handlAllState (boo) {
      this.list.forEach(item => {
        item.isDone = boo // 这里是一个等号，赋值
      })
    }
  },
  computed: {
    list2 () {
      if (this.flag === 2) {
        return this.list.filter(item => item.isDone === false)
      } else if (this.flag === 3) {
        return this.list.filter(item => item.isDone === true)
      } else {
        return this.list
      }
    }
  },
  watch: {
    list: {
      handler (val) {
        localStorage.setItem('todo-list', JSON.stringify(val))
      },
      // immediate: true, // 立即侦听
      deep: true // 深度侦听（用于侦听对象属性的变化）
    }
  }
}
</script>

<style></style>
